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dotfiles/.local/bin/sbacklight
David JULIEN 9d06a61780 legal: change license to GPLv3 in script headers
Kept wondering wether I should keep the MIT (because I highly value
freedom of act) or embrace the GPL (because I don't want this work to
become close-source).

I do understand that this commit (and the next one that is actually
changing the LICENSE) is a defeat for freedom. I guess freedom has been
defeated long time ago, when people and companies figured that was
"free" (as in gratis) was also "free" (as in disposable).

This is not how I think free (as in "libre") works but hey, that surely
is how Intel and other corporations see it (ec: Intel Management Engine
is entirely based on Minix, is close-source, and *maybe* used as a
backdoor by anybody).

It boils down to the Paradox of Tolerance, and I surely won't tolerate
shit going their way. If you want to take open source stuff, be my
guest ; but you have to play by the rules.
2021-02-16 01:09:56 +01:00

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#!/usr/bin/env sh
######################################################################
# @author : swytch
# @file : sbacklight
# @license : GPLv3
# @created : Wednesday May 20, 2020 18:22:36 CEST
#
# @description : control screen brightness
######################################################################
## You need write privileges on /sys/.../brightness
## This can be achieved via a `udev` rule (see ~/.config/root)
current=$(cat /sys/class/backlight/intel_backlight/brightness)
max=$(cat /sys/class/backlight/intel_backlight/max_brightness)
step=$(expr $max / 20)
[ "$1" = "dec" ] && new=$(expr $current - $step)
[ "$1" = "inc" ] && new=$(expr $current + $step)
[ "$1" = "set" ] && new=$(expr $2 \* $step)
[ $new -gt 850 ] && new=850
[ $new -lt 0 ] && new=0
echo $new > /sys/class/backlight/intel_backlight/brightness